With the THOR bullet first you have to size your barrel, get the correct bullet for your barrel, and than work up a load with the powder.
That being said, l agree they are not the most accurate bullet, but than with my eyes and iron sights that you have to use in Colorado they were good enough. l had no trouble getting a 3" group at 100 yards
THOR bullets are made by Barnes bullets, it's designed to shoot without a sabot is the difference. If we could use sabot bullets in Colorado l would use them.